Your reply doesn't even make sense. If I'm using bitrates that result in files much larger than x265 files how exactly am I bitstarving it? Disk space is cheat as dirt? Yeah, it is, which is precisely why I've got 47 TB sitting in my little file server. I'm not sitting here trying to use NVENC to get a movie to fit on a floppy. Heh.
"x265 does it better with less bits" != "I'm not using enough bitrate for NVENC"
You can use bitrates with NVENC that are far, far, FAR beyond what anyone would ever actually use with pretty stupid filesizes as a result and the quality is still blocky garbage. How about instead of saying "You don't know what you're doing." and not backing it up in any way whatsoever, you instead provide an example of settings to use for NVENC in whatever encoding software in order to show me what you consider to be good quality from NVENC? That is, if you're so sure that NVENC can actually produce good results. Surely if that's the case and you use NVENC all the time you've got some settings you typically start with because they typically produce good results, so feel free to share.
x265 and VMAF 97 look pretty good on my 75" TV in the living room. I've yet to see NVENC produce something that doesn't present artifacting clearly visible on my computer monitor, nevermind trying to watch something from it on the living room TV. The computer monitor is nowhere near the TV's size, and if artifacts are blatantly obvious on it they aren't going to be any better on the big TV. NVENC files that yield VMAF 97 results look inferior to the x265 VMAF 97 files. This comes as no surprise for two reasons. NVENC has chroma problems. And VMAF ignores chroma at the moment. Take two different VMAF 97 files, one from x265 and one from NVENC, and run it through the other common metrics and it quickly becomes obvious that the NVENC file is going to look a lot worse, without even having to view it. Viewing it only confirms what those other metrics will already have told you.